Felines and mankind have been residing in harmony for quite some time but that has not always been the case. There have been times when pet cats have been nearly wiped out in the name of God. And what happened the Black Loss of life reigned supreme for a lot longer than it will. So we will get back to the beginnings of recorded history to enough time of the pharaohs of Egypt. Here cats were revered as Gods and many were mummified to last for eternity. As the felines guarded the grain warehouses and wiped out the rats and mice that given on the grain. Therefore reducing famines, which were the curse of Egypt. It had been illegal to wipe out cats in those days, like cows in India today.
I believe one of the reasons there were not many cats around is because they used to consume them. And once in a while the restaurant cat catches would pick up an cat they may find and take them back again to the restaurant. I recall seeing cats in glass exhibits out leading of the restaurants. But somewhere within then and now they banned eating felines. So cats are now not on the menu and today there are cats everywhere. Many of them started off in someone's house and received thrown away, because so many are incredibly friendly. Also they may have this thing about stomach worms. And in those times China was not as modern as now so abdominal worms is a problem. Fleas are not a really problem because they may have tile surfaces and solid wood furniture.